"Du isst ein Fischsandwich."
Translation:You eat a fish sandwich.
In these kind of mixed words like "Fischsandwich", how do we know which gender to take for the article if they are different ?
For example, do we say : "Eine Zitronesandwich" or "Ein Zitronesandwich" ?
I know, lemon sandwiches must be disgusting, it's just for the example.